Master Class Digital Learning Academy

Sound, & Sound Waves, including Technological Use of Sound Waves  1. What type of wave is a sound wave?    a. Transverse wave    b. Longitudinal wave    c. Electromagnetic wave    d. Standing wave  2. Which of the following properties is NOT associated with sound waves?    a. Amplitude    b. Wavelength    c. Frequency    d. Refraction 3. The speed of sound in a medium depends on:    a. Amplitude    b. Frequency    c. Wavelength    d. Medium's properties 4. What is the unit of frequency?    a. Hertz (Hz)    b. Decibel (dB)    c. Watt (W)    d. Joule (J)   5. The phenomenon of the Doppler effect is associated with:    a. Reflection    b. Refraction    c. Diffraction    d. Change in frequency due to motion 6. What is the threshold of hearing for the average human ear in ...

Active and Passive Voice in English  In passive voice, the object of the active voice sentence becomes the _______ of the passive voice sentence. a) subject b) verb c) adjective d) adverb   Identify the active voice sentence from the options below: a) The book was read by the teacher b) A delicious meal is being cooked by my mother c) The car was repaired by the mechanic d) The dog was chased by the cat   Which tense is used to change the following active voice sentence into passive voice: "She has completed her homework"? a) Present simple b) Present continuous c) Present perfect d) Past simple   What is the passive voice of the following sentence: " They will plant trees in the park "? a) Trees will be planted in the park by them b) Trees are planted in the park by them c) Trees were planted in the park by them d) Trees will plant in the park by them   When changing an active voice sentence into passive voice, ...